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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I use Fedore Core 3, when I run some gone like application, such as gedit, opera and so forth, always ok, but sometimes failed, the error message is "GTK-WARNING **: Can't open display" or "Cann't connect to X Server".

Echo $DISPLAY
:localhost:0.0

when I reset $DISPLAY as "0,0", then it will run ok.

I don't known the reason how and why to cause this problem, just wait someone to help me.

It can sometimes happen if your hostname changes, after you get logged in and X is running. If you get an Xterm up, and type in "hostname <somename>", then try to pull up a new X application, it'll often times not work. Just a thought.

Also, FC3 is pretty old, I think....Fedora 7 is out now, wouldn't hurt to upgrade.